How far does the radius of Sun's gravity extend? |
- How far does the radius of Sun's gravity extend?
- Would any of the recent flu vaccines protect me against the flu strain from 1918 if I were to travel back in time?
- How strong is the evidence for alternative hypotheses for the dinosaur extinction event?
- Between 1915 and 1926 a pandemic of encephalitis lethargica kills over 500k people than disappeared in 1927. Was the susceptible population wiped out or what would be reasons why this pandemic disappeared so suddenly?
- Why isn’t the core of the earth primarily the heaviest elements the earth is made of?
- Is energy conserved in the Universe?
- What determines the placebo for a vaccine's clinical trait?
- When you mix two chemicals and a color change is induced, what is going on in the HOMO-LUMO gap?
- How is it determined that a person died of "natural causes"?
- How far can a human eye see an object without losing sense of depth?
- In atoms of normal room temperature materials, are the electron orbitals generally in their ground state or at higher energy levels?
- Do mountains have roots?
- What happens to a vein when it blows up from a needle stick to impact? Does it regenerate or is it dead?
- Does the forgetting curve and spaced repetition apply to procedural memory?
- How did geologists explain earthquakes and mountain-building before plate tectonics?
| How far does the radius of Sun's gravity extend? Posted: 12 Jun 2021 06:20 AM PDT How far does the Sun's gravity reach? And how it affects the objects past Neptune? For instance: how is Pluto kept in the system, by Sun's gravity or by the sum of gravity of all the objects of the system? What affects the size of the radius of the solar system? [link] [comments]  |
| Posted: 12 Jun 2021 01:29 PM PDT Edit: are any of the markers targeted by any of the recent flu vaccines in the 1918 strain of flu and would those protect me if they were? [link] [comments]  |
| How strong is the evidence for alternative hypotheses for the dinosaur extinction event? Posted: 12 Jun 2021 02:20 AM PDT Meteorite strike: I get it. Big bump, irridium, dinos dead. But recently I ran into a geologist who is pointed out that there are other, bigger, craters that are not associated with mass extinctions, and who is convinced there story behind the K-Pg mass extinction event is more complicated. [link] [comments]  |
| Posted: 12 Jun 2021 04:34 PM PDT Was reading about the encephalitis lethargica pandemic on a site and they stated it vanished in 1927 surprisingly and abruptly. What would cause a virus to do this? Seems odd and unnatural to my simple mind. Edit: here's some links for info https://en.m.wikipedia.org/wiki/Encephalitis_lethargica https://unbelievable-facts.com/2017/11/encephalitis-lethargica.html [link] [comments]  |
| Why isn’t the core of the earth primarily the heaviest elements the earth is made of? Posted: 12 Jun 2021 06:40 AM PDT I'd have thought as plates are pushed into the mantle and melted, heavier elements would tend to sink to the core and lighter ones displaced towards the surface. Yet, we find all sorts of heavy elements in the crust. What explains this? [link] [comments]  |
| Is energy conserved in the Universe? Posted: 12 Jun 2021 05:59 AM PDT My question is inspired by an exchange that started with the following comment in r/space. "The issue is all energy must be conserved ... Only where there is a time translation symmetry. Problem is that this simply does not apply to the universe. The total energy of the universe is going down. Imagine a photon flying through space. As it flies for millions of years, being affected by the expansion of space between, you will see it eventually arrive at your detector with a large redshift. The frequency of the light has decreased. As you know by the Planck-Einstein relation, frequency = energy for example in a photon. Where did the energy list from the redshift go? Nowhere. It's just gone and it is not conserved." [link] [comments]  |
| What determines the placebo for a vaccine's clinical trait? Posted: 12 Jun 2021 10:32 AM PDT Why is saline solution the choice of placebo in control groups? What determines it to be used? Are there other placebos and what are differences? [link] [comments]  |
| When you mix two chemicals and a color change is induced, what is going on in the HOMO-LUMO gap? Posted: 12 Jun 2021 01:31 PM PDT I am studying weak interactions and charge transfer between molecules. I've been struggling with finding sources that back up the claim that changes in the HOMO-LUMO gap induce a UV-vis shift and a colorimetric shift. What's really causing these shifts and how can that be described through physical chemistry? [link] [comments]  |
| How is it determined that a person died of "natural causes"? Posted: 12 Jun 2021 01:24 AM PDT Is there such a thing as death by natural causes that is not related to any illness or pre-existing condition? [link] [comments]  |
| How far can a human eye see an object without losing sense of depth? Posted: 12 Jun 2021 12:49 PM PDT How far can a human eye see an object without losing sense of depth? .,in other words how far can a human eye see and still be able to distinguish between two objects placed at slightly different places.( Like we can't distinguish the depth of stars, we will see it as every star is equidistant from us. ) This question came in my head today while i was enjoying the cold breeze after rain ,and i was watching the sky and clouds and i suddenly felt that i am able to feel the depth between a cloud that was floating above me and the star that was at infinity ( from optics pov) [link] [comments]  |
| Posted: 12 Jun 2021 12:45 AM PDT |
| Posted: 11 Jun 2021 02:11 PM PDT An iceberg floating in the ocean hides 90 percent of itself underwater. Do mountains have the same feature and bury most of their mass under earth's surface? [link] [comments]  |
| Posted: 11 Jun 2021 09:22 AM PDT |
| Does the forgetting curve and spaced repetition apply to procedural memory? Posted: 11 Jun 2021 08:01 AM PDT I've read a little bit about the forgetting curve and how using spaced repetition can help counter it. I also know that declarative and procedural memory differ in certain ways, so I was wondering if the forgetting curve and spaced repetition still apply for procedural. The reason I'm curious is because I'm learning to drive, and I have two choices as to how I can split the professional lessons I get. I don't have my own car or any friends that will lend me their car, so the only practice I can really do is with the driving instructor's car. I have to wait a period of 8 months until I can take the road test. There are 10 lessons or sessions I can practice in the car in total. Option 1: I take some or 5 of the lessons now, applying the model of spaced repetition for a month, something like: day 1, day 3, day 7, day 14, day 28. But then I would have to wait until next May (when my classes end, since I really need to focus on them this year), which is 10 months later, before I take the other 5 lessons and then do my road test. Option 2: I take all 10 lessons in a similar spaced repetition manner starting next May, and then take the road test after that. I think its probably better to go with Option 2, only because there's a 10 month period where I can't do any driving with Option 1, and I'm worried that if the forgetting curve for procedural memory is pretty similar to declarative, then I'd basically be starting over if I took the other half of the lessons 10 months later. It just feels weird to not practice at all until then. Maybe if I could practice with my own car once every month then Option 1 would be viable. I know this seems a bit overkill, but even if it is, I think it would be interesting to find an answer anyways. Thanks for any help provided! [link] [comments]  |
| How did geologists explain earthquakes and mountain-building before plate tectonics? Posted: 11 Jun 2021 11:58 AM PDT |
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